In a bowl, combine the tomalley and fat, egg, water, fish sauce, pepper, and chopped cilantro and mix well.,Measure the mixture; you want about 3/4 cup total.,Add water if needed.,In a wok or large skillet, heat the oil over medium heat.,Add the shallot and stir-fry for about 2 minutes, or until soft.,Add the crabmeat and mushrooms and stir-fry for about 1 minute, or until aromatic.,Add the noodles and continue to stir-fry for about 2 minutes, or until they begin to soft en.,They noodles will look a bit dry.,______,Quickly work the mixture into the noodles to ensure an even distribution of flavors, lowering the heat if the noodles begin to clump.,In about 2 minutes, the noodles will become translucent and lightly golden.,Remove from the heat and taste and adjust with extra sprinkles of fish sauce and/or pepper.,Transfer to a serving plate and serve immediately.